Radar monitoring device and system for shallow underground DNAPL distribution real-time detection

The utility model belongs to the technical field of water quality detection, and particularly relates to a radar monitoring device and system used for shallow underground DNAPL distribution real-time detection, the device comprises a box body, the box body is divided into a first isolation cavity, a second isolation cavity and a third isolation cavity through partition plates, a transmitter and a transmitting antenna are installed in the first isolation cavity, and the third isolation cavity is provided with a second isolation cavity. An alarm device is installed in the second isolation cavity, and a receiver and a receiving antenna are installed in the third isolation cavity. An arc-shaped clamping groove is formed in the front portion of the box body, the arc-shaped clamping groove is used for clamping the box body to a drill rod of a drilling machine, two oppositely-arranged fixing pieces are arranged on a front side plate of the box body, and clamping holes are formed in the fixing pieces, and bolts can p